Rub the comb with
the wool and then place it near the puffed rice. Put some of
the rice in the plastic bag. Blow air into the bag and seal it
with the tie. Rub the wool over the bag. Now rub both the bag
and the comb with the wool.

Static electricity is created when an object gives up or gains electrons. Rubbing wool over something made of plastic or hard rubber gives that object a negative charge which will attract any object with a positive charge. The wool gives up electrons to the plastic. This kind of charge is called "static" because it is not moving along a wire or other conductor.

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